Paradise Builders

pdul · 2012-10-30 5:37 pm

A lot of good possibilities, Thank you guys

I must admit that i fell in love with the Lumberg solution, when i saw that it is good for 5A. Very compact too :up:

pdul · 2012-10-30 5:56 pm

What is the minimum DC voltage, I can feed into the shuntreg on paradise?

Joachim Gerhard · 2012-10-30 5:58 pm

I use the Lumbergs too, they have a convenient locking system.

Joachim Gerhard · 2012-10-30 6:00 pm

I think the absolute minimum is 25V. When the Leds do not glow you have too little.

pdul · 2012-10-30 6:01 pm

Thanks.

pdul · 2012-10-30 8:08 pm

I just salvaged a nice transformer from a JVC home theatre, and measured it to 18,4-18,4v unloaded. with a simple prereg. and both paradise boards connected, i measure +/-23v and all the leds are glowing. Best of all the heatsinks cant be used as a stowe anymore, temp. around 40 degrees Celsius.
So how low can we go.

Joachim Gerhard · 2012-10-30 8:13 pm

When it works, it works. Maybe you got a new low voltage record.

pdul · 2012-10-30 8:28 pm

Backside is that i used it to keep my coffeecup warm while soldering, so now i have to remember to drink it faster

hesener · 2012-10-31 9:14 am

Leaving 5V (23V-18V) for the current sources is a low number, I think it should not go below that. While they will still be working, the noise isolation they provide will degrade a little bit, due to the VAS parameter of the bipolars increasing at low VCE - not dramatic though. Maybe Frans has looked into this, any comments?

Benedetto · 2012-10-31 9:20 am

btw
where is Frans ?

FdW · 2012-10-31 9:32 am

I'm here, catching up with the 'after holydays work' and lurking a bit

. I will check it out; yes it seems a bit low. This was discussed before, I will dig it up.

FdW · 2012-10-31 9:35 am

This is the one http://www.diyaudio.com/forums/analogue-source/154210-mpp-647.html#post3110294 #6462 it states that 24Vdc (on the input side) is the absolute minimum.

FdW · 2012-10-31 9:37 am

pdul said:
I just salvaged a nice transformer from a JVC home theatre, and measured it to 18,4-18,4v unloaded. with a simple prereg. and both paradise boards connected, i measure +/-23v and all the leds are glowing. Best of all the heatsinks cant be used as a stowe anymore, temp. around 40 degrees Celsius.
So how low can we go.

The 23Vdc is below spec

you need a bit more.

hesener · 2012-10-31 9:37 am

He sent me a message that he is "officially" back from vacation, so he should be here any minute ;-)

PS: Oh there you are....

FdW · 2012-10-31 9:46 am

FdW said:
The 23Vdc is below spec you need a bit more.

A quick run in the simulator shows these output residuals for:
Green 25Vdc, Blue 24Vdc and Red 23Vdc.

As you see 23Vdc is marginal.

pdul · 2012-10-31 9:51 am

I dont know if it makes any difference, but the trannies i use are ON semi MJE15032/33

pdul · 2012-10-31 9:56 am

It looks to me as 25 will be the minimum.

FdW · 2012-10-31 10:05 am

pdul said:
It looks to me as 25 will be the minimum.

25Vdc is the recomended minimum as specified in Mpp #6462.

GandRalf · 2012-10-31 10:06 am

pdul said:
Anybody with a take on interconnects between preamp cabinet and psu cabinet?
Wire? connectors? Etc.?

For powersupply I use microfonplugs for radio devices like this.

Up to 60V and 1A.

FdW · 2012-10-31 10:07 am

pdul said:
I dont know if it makes any difference, but the trannies i use are ON semi MJE15032/33

Those will work fine

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